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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
There was probably mutating of the input in your solution, which influenced how reference solution was computed. I've resubmitted the test suite, so that reference is not affected by mutation and checked, that your solution works. Could you check that, please?